The purpose of the study is to study the process of development of the problem of the administrative-territorial structure of Siberia in the program documents of the parties of the Cadets and the Social Revolutionaries and the results of their implementation in the revolutionary year of 1917. Research objectives: 1. To analyze the program settings of the party of the Cadets and the Socialist-Revolutionaries on the issues of the administrative-territorial structure of the regions of Russia. 2. Conduct a comparative analysis of the vision of the future administrative-territorial structure of Siberia by the Siberian branches of the Constitutional Democratic Party and the Party of Socialist Revolutionaries. 3. To investigate the political activities of the Siberian branches of the parties of the Cadets and the Social Revolutionaries in the implementation of program guidelines on the issue of the administrative-territorial administration of Siberia in 1917. The object of the study is the Constitutional Democratic Party and the Party of Socialist Revolutionaries. The subject of the research is the activities of the parties of the Cadets and Socialist-Revolutionaries in developing the problem of administrative-territorial administration of Siberia and attempts to implement them in the conditions of the revolution of 1917. The article reveals the content of the program provisions of the parties of the Cadets and Socialist-Revolutionaries on the problem of administrative-territorial administration of the regions of Russia, including Siberia. The dynamics of the development of the views of the Siberian cadets is analyzed from the creation of a single all-Siberian regional Duma with legislative powers to the idea of autonomy for Siberia and, finally, for secession from Bolshevik Russia. The features of the program settings of the Siberian Social Revolutionaries on the issue of the autonomy of Siberia are revealed. Shows the activities of the party of socialist revolutionaries in the creation of anti-Soviet authorities in Siberia in the face of the Provisional Siberian Regional Council and the Siberian Regional Duma. Thus, the Siberian Cadets advocated the creation of a territorial autonomy for Siberia under the slogan "United and indivisible Russia". In contrast to them, the Socialist-Revolutionary Party did not have clear positions on the issue of the future administrative-territorial structure of Siberia, but proceeded from the specific situation that was developing in Russia during a particular period of revolution and civil war.